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sock_sendmsg(): implicit function calls by KernelThanks. It worked as expected on Fedora (Kernel 3.12 with uprobes enabled), but didn't on Debian (Kernel 3.2 with uprobes disabled). Does uprobes feature needed for print_ubacktrace() to work properly? BTW, when I invoked stap command on Fedora with those options, the following message was printed: WARNING: Missing unwind data for module, rerun with 'stap -d /usr/lib64/libnss_dns-2.18.so'. Doesn't --ldd options unwind shared libraries automatically?

sock_sendmsg(): implicit function calls by KernelThanks. The following is the error message I got when I tried to insert print_ubacktrace(): user-space facilities not available without kernel CONFIG_UTRACE. In my environment print_ubacktrace() is defined in tapset/ucontext-unwind.stp and include /* pragma:uprobes */, so I'm pretty sure print_ubacktrace() needs CONFIG_UPROBES.

Apache SSLInsecureRenegotiation directive not workingThanks, noloader. I looked through the source code of Apache (ssl_engine_kernel.c) and found that from Apache 2.2.15 up to Apache 2.4.7 (latest), every client-initiated renegotiation in an ssl session is rejected and cause the ssl session to be aborted.